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← ScienceWhich consequence results when thermal gradients shift laser wavelength?
A)Reduced fringe visibility on target✓
B)Shorter coherence length of laser
C)Expanded area of focal spot
D)Increased power within diffraction rings
💡 Explanation
Laser wavelength shift introduces variable phase delays; therefore constructive and destructive interference diminishes fringe pattern contrast because the **superposition principle** weakens the maxima relative to the minima, rather than increased coherence.
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